Senior Full-Stack Engineer (TypeScript/Java/Kotlin) - Remote

key.dev; United States; Remote; USD 120,000 - 180,000; Full time

Benefits offered by this job

25 days annual leave

Health insurance

Multisport benefit

Career and skills development

Job summary

key.dev is seeking a seasoned full-stack engineer to build and operate production software across the frontend and backend for international client projects. You’ll take work from design through deployment, contribute to technical decisions, and help improve the infrastructure that supports the team’s services.

Responsibilities include developing backend services and accessible web apps, owning features end-to-end, writing maintainable code with automated tests, and collaborating in an agile

Qualifications

• 5+ years building and operating production full-stack systems.
• Strong web fundamentals: HTML, CSS, and JavaScript or TypeScript; framework experience (React/Preact/Vue).
• Backend experience with Java or Kotlin and frameworks like Ktor or Spring Boot.
• Working knowledge of SQL databases and schema design; CI/CD and cloud experience.
• Fluent English; based in Bulgaria or the EU and eligible to work there without visa sponsorship.

Responsibilities

• Develop backend services and accessible, performant web applications.
• Own features through design, implementation, deployment, and operation.
• Write maintainable code and add automated tests.
• Contribute to architecture discussions and solve multi-tier technical problems.
• Help maintain infrastructure and observability tools.
• Collaborate with colleagues in an agile setting and share technical knowledge.

Skills

HTML, CSS, JavaScript/TypeScript

React/Preact/Vue

Tools

Ktor

Spring Boot

Job description

key.dev is seeking a seasoned full-stack engineer to build and operate production software across the frontend and backend for international client projects. You’ll take work from design through deployment, contribute to technical decisions, and help improve the infrastructure that supports the team’s services.

Responsibilities include developing backend services and accessible web apps, owning features end-to-end, writing maintainable code with automated tests, and collaborating in an agile